Offshore wind power multi-terminal high voltage direct current topology optimization method, device and storage medium

Abstract

The present invention discloses an offshore wind power multi-terminal high-voltage direct current topology optimization method, device and storage medium, and relates to the technical field of offshore wind power transmission system topology. The method includes: determining a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection; determining constraint conditions, generating new sea-land multi-terminal high-voltage topology structures based on the constraint conditions and each basic offshore wind power cluster sea-land multi-terminal high-voltage topology structure, forming a sea-land multi-terminal high-voltage topology structure set by the new sea-land multi-terminal high-voltage topology structure and each basic offshore wind power cluster sea-land multi-terminal high-voltage topology structure, and obtaining wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set; determining the reliability index coefficient and cost index coefficient of each topology structure based on the wind power attribute information; determining the target topology structure in the sea-land multi-terminal high-voltage topology structure set based on the reliability index coefficient and the cost index coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power transmission system topology, and in particular to an offshore wind power multi-terminal high voltage direct current topology optimization method, device and storage medium. Background Art

[0002] With the rapid development of new energy in recent years, offshore wind power, as an important renewable energy, has made great progress worldwide. Modular multi-terminal high-voltage direct current topology technology plays an important role in offshore wind power transmission, mainly because it has higher transmission efficiency and flexibility, and is particularly suitable for power transmission in offshore wind farms. In order to make fuller use of offshore wind power resources, the selection of modular multi-terminal high-voltage direct current topology for offshore wind power is particularly important.

[0003] At present, the topology is usually determined manually. However, this method of determining the offshore wind power multi-terminal high-voltage direct current topology is greatly affected by human subjective factors, resulting in the inability to accurately determine the offshore wind power multi-terminal high-voltage direct current topology, so that the determined offshore wind power multi-terminal high-voltage direct current topology cannot meet the actual transmission needs. Summary of the invention

[0004] The present invention provides a method, device and storage medium for optimizing the topology of multi-terminal high-voltage direct current (HVDC) offshore wind power, which is mainly capable of improving the accuracy of determining the topological structure of multi-terminal high-voltage direct current offshore wind power, so that the determined topological structure of multi-terminal high-voltage direct current offshore wind power meets the actual power transmission demand.

[0005] According to a first aspect of the present invention, there is provided a method for optimizing an offshore wind power multi-terminal high voltage direct current topology, comprising:

[0006] Determine a preset number of basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures based on converter-breaker interconnection;

[0007] Determine constraint information for generating a new topology structure, generate a new sea-land multi-terminal high-voltage topology structure based on the constraint information and the sea-land multi-terminal high-voltage topology structures of each of the basic offshore wind power clusters, form a sea-land multi-terminal high-voltage topology structure set by the new sea-land multi-terminal high-voltage topology structure and the sea-land multi-terminal high-voltage topology structures of each of the basic offshore wind power clusters, and obtain wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0008] Based on the wind power attribute information, determine the reliability index coefficient and cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0009] Based on the reliability index coefficient and the cost index coefficient, a target offshore wind power multi-terminal high-voltage direct current topology structure is determined in the offshore and onshore multi-terminal high-voltage topology structure set.

[0010] Optionally, the determining of a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-breaker interconnection includes:

[0011] Based on the offshore wind farm, offshore converter system, submarine DC cable and onshore converter system, a topological structure of two-connected circuit breakers on the DC side of offshore and onshore converters, a topological structure of two-connected circuit breakers on the AC side of offshore and onshore converters, a topological structure of two-connected circuit breakers on the DC side of offshore converter and the AC side of onshore converter, and a topological structure of two-connected circuit breakers on the AC side of offshore converter and the DC side of onshore converter are constructed.

[0012] Optionally, the constraint information includes: submarine cable capacity constraint, submarine cable current carrying capacity constraint, transmission submarine cable cross constraint, equipment selection constraint, and converter quantity constraint of the offshore wind farm;

[0013] The generating of a new sea-land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures includes:

[0014] Initialize the configuration parameters of the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster, wherein the configuration parameters include the current carrying capacity of the submarine cable of the offshore wind farm, the purchase cost of the switch cabinet, the installation cost of the switch cabinet, the operation and maintenance cost of each submarine cable per unit length, the operation and maintenance cost of the switch cabinet, the repair cost after the switch cabinet fails, and the repair cost after the failure of each submarine cable per unit length;

[0015] Based on the submarine cable capacity constraints, submarine cable current carrying capacity constraints, transmission submarine cable cross constraints, equipment selection constraints, and converter quantity constraints of the offshore wind farm, the connection mode between the nodes in the initialized sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster is transformed to obtain a new sea-land multi-terminal high-voltage topology structure.

[0016] Optionally, generating a new sea-land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures includes:

[0017] Determine the number of wind turbines connected to the submarine cable in the sea-land multi-terminal high-voltage topology of the basic offshore wind power cluster, the wind turbine capacity of each wind turbine, the rated output information of each wind turbine, the rated voltage of the submarine cable, the power factor of the submarine cable, the standard submarine cable size set, the standard rated capacity set of the transformer, and the range value of the number of converters;

[0018] Based on the number of wind turbines and the wind turbine capacity, determine the upper limit of the submarine cable capacity; based on the number of wind turbines, the rated output information, the rated voltage of the submarine cable, and the power factor of the submarine cable, determine the lower limit of the current carrying capacity of the submarine cable;

[0019] Determining a submarine cable selection constraint based on the standard submarine cable size set, determining a transformer selection constraint based on the transformer standard rated capacity set, and determining a converter quantity constraint based on the converter quantity range value;

[0020] When the submarine cable capacity is less than the upper limit of the submarine cable capacity, the current carrying capacity of the submarine cable is greater than the lower limit of the submarine cable current carrying capacity, there is no intersection between the submarine cables in the transmission submarine cable, the submarine cable meets the submarine cable selection constraints, the transformer meets the transformer selection constraints, and the converter meets the converter quantity constraints, a new sea-land multi-terminal high-voltage topology structure is generated based on the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster.

[0021] Optionally, the wind power attribute information includes: grid-connected electricity price information, maximum transmission capacity information of cables, output information of the offshore wind farm, probability information of cable failure, probability information of circuit breaker failure, probability information of wind turbine failure, active output information of the wind farm at each moment, and total system capacity of the offshore wind farm;

[0022] The step of determining the reliability index coefficient of each topology structure in the sea-land multi-terminal high voltage topology structure set based on the wind power attribute information includes:

[0023] Based on the maximum transmission capacity information of the cable, the output information of the offshore wind farm, the probability information of cable failure, the probability information of circuit breaker failure, the probability information of wind turbine failure, and the active output information of the wind farm at each moment, determine the expected value of annual power generation loss of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0024] Based on the expected value of annual power generation loss and the grid-connected electricity price information, determine the annual failure opportunity cost coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0025] Based on the expected value of annual power generation loss and the total capacity of the system, determine the annual outage hours coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0026] Determine the system availability coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the expected value of annual power generation loss, the total system capacity, and a preset benchmark reference value;

[0027] The weight coefficients corresponding to the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient are determined respectively, and based on the weight coefficients, the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient are added together to obtain the reliability index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0028] Optionally, the wind power attribute information also includes: discount rate, design life of the offshore wind farm, purchase and installation cost of switch cabinet, number of submarine cable segments, price per unit length of submarine cable, coordinates of wind turbines at both ends of the submarine cable, operation and maintenance cost per unit length of submarine cable, operation and maintenance cost of switch cabinet, loss coefficient of submarine cable, working current of submarine cable, resistance per unit length of submarine cable, length of submarine cable, annual power generation time of wind turbine, sea area used by offshore wind farm, annual usage fee per unit sea area, probability of switch cabinet failure, maintenance cost after switch cabinet failure, probability of submarine cable failure per unit length, maintenance cost after submarine cable failure per unit length, and on-grid electricity price;

[0029] Based on the wind power attribute information, the cost index coefficient of each topology structure in the sea-land multi-terminal high voltage topology structure set is determined, including:

[0030] Determining the discount coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the discount rate and the design life of the offshore wind farm;

[0031] Based on the purchase and installation cost of the switch cabinet, the number of segments of the submarine cable, the price per unit length of the submarine cable, and the coordinates of the wind turbines at both ends of the submarine cable, determine the annualized initial investment cost of each topology in the sea-land multi-terminal high-voltage topology set;

[0032] Based on the number of submarine cable segments, the operation and maintenance cost of the submarine cable per unit length, and the operation and maintenance cost of the switch cabinet, determine the annual operation and maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0033] Based on the number of submarine cable segments, the submarine cable loss coefficient, the submarine cable operating current, the submarine cable resistance per unit length, the submarine cable length, the on-grid electricity price, and the annual power generation time of the wind turbine, determine the annual line loss cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0034] Determine the sea area usage fee for each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the sea area used by the offshore wind farm and the annual usage fee per unit sea area;

[0035] Based on the probability of failure of the switch cabinet, the maintenance cost after the failure of the switch cabinet, the number of submarine cable segments, the probability of failure of the submarine cable per unit length, the length of the submarine cable, and the maintenance cost after the failure of the submarine cable per unit length, determine the annual maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0036] Based on the discount factor, the annualized initial investment cost, the annual operation and maintenance cost, the annual line loss cost, the sea area use fee, the annual maintenance cost, and the annual failure opportunity cost coefficient, the cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set is determined.

[0037] Optionally, the determining a target offshore wind power multi-terminal high voltage direct current topology structure in the sea-land multi-terminal high voltage topology structure set based on the reliability index coefficient and the cost index coefficient includes:

[0038] Determine the evaluation weight coefficients corresponding to the reliability index coefficient and the cost index coefficient respectively, and based on the evaluation weight coefficient, add the reliability index coefficient and the cost index coefficient to obtain the performance evaluation parameters of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0039] Based on the performance evaluation parameters, a target offshore wind power multi-terminal high voltage direct current topology structure is determined in the offshore and onshore multi-terminal high voltage topology structure set.

[0040] According to a second aspect of the present invention, there is provided an offshore wind power multi-terminal high voltage direct current topology optimization device, comprising:

[0041] A first determination unit is used to determine a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-breaker interconnection;

[0042] A generating unit, used to determine constraint information for generating a new topology structure, generate a new sea-land multi-terminal high-voltage topology structure based on the constraint information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, form a sea-land multi-terminal high-voltage topology structure set by the new sea-land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, and obtain wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set;

[0043] A second determination unit is used to determine the reliability index coefficient and the cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the wind power attribute information;

[0044] The third determination unit is used to determine the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea-land multi-terminal high-voltage topology structure set based on the reliability index coefficient and the cost index coefficient.

[0045] According to a third aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above offshore wind power multi-terminal high voltage direct current topology optimization method.

[0046] According to a fourth aspect of the present invention, there is provided a computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above offshore wind power multi-terminal high voltage direct current topology optimization method when executing the program.

[0047] According to a method, device and storage medium for optimizing an offshore wind power multi-terminal high-voltage direct current topology provided by the present invention, compared with the current method of manually determining the topology structure, the present invention determines a preset number of basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection; and determines the constraint condition information for generating a new topology structure, and generates a new sea and land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures, and the new sea and land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures constitute a sea and land multi-terminal high-voltage topology structure set, and obtains wind power attribute information of each topology structure in the sea and land multi-terminal high-voltage topology structure set; then, based on the wind power attribute information, determines the reliability index coefficient and cost index coefficient of each topology structure in the sea and land multi-terminal high-voltage topology structure set; finally, based on the reliability index coefficient and cost index coefficient, determines the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea and land multi-terminal high-voltage topology structure set. Therefore, the present invention can generate a variety of new offshore and land multi-terminal high-voltage topological structures that meet the constraints by generating the constraints of the new topological structure and the basic offshore wind power cluster sea and land multi-terminal high-voltage topological structure, thereby increasing the selection range of the topological structure, and can more comprehensively examine the characteristics of various structures when selecting the optimal topological structure, avoiding inaccurate judgments due to lack of sufficient comparison basis, and thus more accurately selecting the optimal target offshore wind power multi-terminal high-voltage topological structure that meets the power transmission requirements, and then selecting the optimal target offshore wind power multi-terminal high-voltage topological structure from the sea and land multi-terminal high-voltage topological structure set according to the reliability index and the cost index, so that the determined target offshore wind power multi-terminal high-voltage topological structure can meet both the reliability requirements and the cost requirements, that is, meet multiple needs, so that the selection of the target offshore wind power multi-terminal high-voltage topological structure is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the embodiments of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0049] Figure 1 A flow chart of a method for optimizing an offshore wind power multi-terminal high voltage direct current topology provided by an embodiment of the present invention is shown;

[0050] Figure 2a A schematic diagram showing a crossing situation between power transmission submarine cables provided by an embodiment of the present invention is shown;

[0051] Figure 2b A schematic diagram showing another crossing situation between power transmission submarine cables provided by an embodiment of the present invention is shown;

[0052] Figure 2c A schematic diagram showing another crossing situation between power transmission submarine cables provided by an embodiment of the present invention is shown;

[0053] Figure 3 A flow chart of another offshore wind power multi-terminal high voltage direct current topology optimization method provided by an embodiment of the present invention is shown;

[0054] Figure 4 A schematic diagram of a DC-side interconnected offshore wind power multi-terminal high-voltage DC topology structure provided by an embodiment of the present invention is shown;

[0055] Figure 5 A schematic diagram of an AC-side interconnected offshore wind power multi-terminal high-voltage direct current topology structure provided by an embodiment of the present invention is shown;

[0056] Figure 6 A schematic diagram of an offshore wind power multi-terminal high voltage direct current topology structure with an offshore direct current side interconnected and an onshore alternating current side interconnected provided by an embodiment of the present invention is shown;

[0057] Figure 7 A schematic diagram of an offshore wind power multi-terminal high voltage direct current topology structure with onshore direct current side interconnection and offshore alternating current side interconnection provided by an embodiment of the present invention is shown;

[0058] Figure 8 A schematic diagram of the structure of an offshore wind power multi-terminal high voltage direct current topology optimization device provided by an embodiment of the present invention is shown;

[0059] Fig. 9 A schematic diagram of the physical structure of a computer device provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0060] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0061] At present, the method of manually determining the topology structure is greatly affected by human subjective factors, resulting in the inability to accurately determine the offshore wind power multi-terminal high-voltage direct current topology structure, making the determined offshore wind power multi-terminal high-voltage direct current topology structure unable to meet the actual power transmission needs.

[0062] In order to solve the above problems, an embodiment of the present invention provides a method for optimizing an offshore wind power multi-terminal high voltage direct current topology, such as Figure 1 As shown, the method includes:

[0063] 101. Determine a preset number of offshore wind power clusters based on converter-breaker interconnection and multi-terminal high-voltage topology structures.

[0064] Among them, the preset number is set according to actual needs. For the embodiment of the present invention, the offshore wind power cluster sea-land multi-terminal high-voltage topology structure based on the converter-circuit breaker interconnection is mainly composed of an offshore wind farm, an offshore converter system, a submarine DC cable, an onshore converter system, etc. In order to simulate the actual module structure of the offshore wind power transmission system connected to the onshore power grid, the modularization of the topological model proposed in the embodiment of the present invention is embodied in that an onshore converter direct / ac interconnection module and an offshore converter direct / ac interconnection module are designed to connect the offshore wind farm to the power grid. Design an offshore wind power multi-terminal high-voltage direct current topology diagram of the AC / DC side converter-circuit breaker interconnection, and establish an AC / DC side converter-circuit breaker interconnection structure. When designing the topology, if there are n offshore wind farms that transmit wind power to the onshore power grid through the offshore and onshore converter systems to realize power supply, the embodiment of the present invention designs an offshore wind power multi-terminal high-voltage direct current topology structure based on converter-circuit breaker interconnection from three aspects: modularization, multi-terminal, and converter-circuit breaker interconnection.

[0065] 102. Determine constraint information for generating a new topology structure, generate a new onshore and offshore multi-terminal high-voltage topology structure based on the constraint information and the onshore and offshore multi-terminal high-voltage topology structures of each basic offshore wind power cluster, form an onshore and offshore multi-terminal high-voltage topology structure set consisting of the new onshore and offshore multi-terminal high-voltage topology structure and the onshore and offshore multi-terminal high-voltage topology structures of each basic offshore wind power cluster, and obtain wind power attribute information of each topology structure in the onshore and offshore multi-terminal high-voltage topology structure set.

[0066] Among them, the constraint information refers to the submarine cable capacity constraint, the submarine cable current carrying capacity constraint, the transmission submarine cable cross constraint, the equipment selection constraint and the converter quantity constraint; the wind power attribute information includes: the on-grid electricity price information, the maximum transmission capacity information of the cable, the output information of the offshore wind farm, the probability information of the cable failure, the probability information of the circuit breaker failure, the probability information of the wind turbine failure, the active output information of the wind farm at each time, the total system capacity of the offshore wind farm, the discount rate, the design life of the offshore wind farm, the purchase and installation cost of the switch cabinet, the number of submarine cable sections, the price per unit length of the submarine cable, the coordinates of the wind turbines at both ends of the submarine cable, the operation and maintenance cost of the submarine cable per unit length, the operation and maintenance cost of the switch cabinet, the submarine cable loss coefficient, the submarine cable working current, the resistance of the submarine cable per unit length, the length of the submarine cable, the annual power generation time of the wind turbine, the sea area used by the offshore wind farm, the annual usage fee per unit sea area, the probability of the switch cabinet failure, the maintenance cost after the switch cabinet failure, the probability of the submarine cable failure per unit length, the maintenance cost after the submarine cable failure per unit length, etc.

[0067] For the embodiment of the present invention, in order to increase the selectivity of the topology structure, it is also necessary to generate multiple new sea-land multi-terminal high-voltage topology structures. Based on this, step 102 specifically includes: determining the number of wind turbines connected to the submarine cable in the sea-land multi-terminal high-voltage topology structure of the basic offshore wind power cluster, the wind turbine capacity of each wind turbine, the rated output information of each wind turbine, the rated voltage of the submarine cable, the power factor of the submarine cable, the standard submarine cable size set, the standard rated capacity set of the transformer, and the range value of the number of converters; based on the number of wind turbines and the wind turbine capacity, determining the upper limit value of the submarine cable capacity, based on the number of wind turbines, the rated output information, the rated voltage of the submarine cable, and the power factor of the submarine cable , determine the lower limit of the current carrying capacity of the submarine cable; determine the submarine cable selection constraint based on the standard submarine cable size set, and determine the transformer selection constraint based on the standard rated capacity set of the transformer, and determine the converter quantity constraint based on the converter quantity range value; when the submarine cable capacity is less than the upper limit of the submarine cable capacity, the current carrying capacity of the submarine cable is greater than the lower limit of the submarine cable current carrying capacity, there is no intersection between the submarine cables in the transmission submarine cable, the submarine cable meets the submarine cable selection constraint, the transformer meets the transformer selection constraint, and the converter meets the converter quantity constraint, based on each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, generate a new sea-land multi-terminal high-voltage topology structure.

[0068] Specifically, when designing a new sea-land multi-terminal high-voltage topology, when selecting a submarine cable, it should be ensured that the capacity of the selected submarine cable should be much larger than the total capacity of the connected wind turbines. This submarine cable capacity constraint can be expressed as the following formula:

[0069]

[0070] Among them, Ni is the number of wind turbines connected to the i-th submarine cable, is the capacity of the j-th wind turbine connected to the i-th submarine cable, is the maximum submarine cable capacity limited by the i-th submarine cable.

[0071] At the same time, considering the limitation of the current carrying capacity of submarine cables, the maximum current carrying capacity of the submarine cable segment should not be less than The sum, therefore, the current carrying capacity constraint of the submarine cable can be expressed as the following formula:

[0072]

[0073] In the formula, I sc is the current carrying capacity of the submarine cable, N i is the number of wind turbines connected to the i-th submarine cable, P wt For each fan’s rated output information, U c is the rated voltage of the submarine cable, and cosδ is the power factor of the submarine cable.

[0074] At the same time, considering the installation of submarine cables and actual engineering requirements, crossover between transmission submarine cables is not allowed. For example, the crossing of submarine cables can be divided into three situations (such as Figure 2a , Figure 2b , Figure 2c As shown in the figure), if the node position coordinates are points A(a1,a2), B(b1,b2), C(c1,c2), and D(d1,d2), the node position coordinates are used to determine whether there is a crossing between the submarine cables. The submarine cable crossing constraint is as follows:

[0075]

[0076] At the same time, equipment selection includes submarine cable size selection and transformer selection. The submarine cable size must comply with standard submarine cable regulations, as shown below:

[0077]

[0078] in, The size of the submarine cable used; It is a set of standard submarine cable sizes. The rated capacity of a single transformer needs to meet the requirements of the standardized transformer rated capacity, as shown below:

[0079]

[0080] in, is the rated capacity of a single transformer; It is a set of standard rated capacities of transformers.

[0081] At the same time, the number of converters required is as follows:

[0082]

[0083] in, and is the minimum and maximum number of converters in the planned transmission topology; Z p is a binary variable, representing the candidate address s of the converter, It is the set of all nodes on both sides of the AC and DC converter station.

[0084] Specifically, the configuration parameters of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology are first initialized, and then the nodes in the initialized basic offshore wind power cluster sea-land multi-terminal high-voltage topology are reconnected under the limit of the constraint conditions to obtain a new sea-land multi-terminal high-voltage topology. Establish priority: Find the local optimal topology according to the constraint conditions: Establish a priority queue, considering the difficulty of installation, long construction time, and high equipment cost faced by offshore wind power equipment construction, so that the priority of the offshore converter system is higher than that of the onshore converter system. The DC circuit breaker is easy to install, low-cost and commonly used, so that the DC interconnection priority is higher than the AC interconnection. According to the established priority, the topology that meets the constraint conditions will constitute a set (sea-land multi-terminal high-voltage topology set) to achieve the goal of local optimization. Finally, the optimal target sea-land multi-terminal high-voltage topology is selected from the sea-land multi-terminal high-voltage topology set. Therefore, the embodiment of the present invention can generate a variety of new sea-land multi-terminal high-voltage topological structures that meet the constraints of the new topological structure and the basic offshore wind power cluster sea-land multi-terminal high-voltage topological structure, thereby increasing the selection range of the topological structure. When selecting the optimal topological structure, the characteristics of various structures can be more comprehensively examined to avoid making inaccurate judgments due to lack of sufficient comparison basis, and thus the optimal target sea-land multi-terminal high-voltage topological structure that meets the power transmission requirements can be more accurately selected.

[0085] 103. Based on wind power attribute information, determine the reliability index coefficient and cost index coefficient of each topology structure in the sea and land multi-terminal high-voltage topology structure set.

[0086] 104. Based on the reliability index coefficient and the cost index coefficient, determine the target offshore wind power multi-terminal high-voltage direct current topology structure from the set of offshore and onshore multi-terminal high-voltage topology structures.

[0087] For the embodiment of the present invention, according to the opening and closing state of the circuit breaker, the reliability index coefficient of each topology in the set of sea-land multi-terminal high-voltage topology structures is analyzed, such as analyzing the reliability of various topologies such as the topology of the two-two connection of the circuit breakers on the DC side of the offshore and onshore converters, the two-two connection of the circuit breakers on the AC side of the offshore and onshore converters, the two-two connection of the circuit breakers on the DC side of the offshore converter and the AC side of the onshore converter, and the two-two connection of the circuit breakers on the AC side of the offshore converter and the DC side of the onshore converter. The initial investment cost, operation and maintenance cost, loss cost, sea area usage fee, and the annual power loss cost and annual maintenance cost when a transmission system fails are defined as cost index coefficients. Finally, according to the reliability index coefficient and the cost index coefficient, the optimal target offshore wind power multi-terminal high-voltage DC topology is determined in the set of sea-land multi-terminal high-voltage topology structures. Therefore, the embodiment of the present invention selects the optimal target sea-land multi-terminal high-voltage topology structure from the set of sea-land multi-terminal high-voltage topology structures through reliability indicators and cost indicators, so that the determined target sea-land multi-terminal high-voltage topology structure can meet both reliability requirements and cost requirements, that is, meet multiple needs, so that the selection of the target sea-land multi-terminal high-voltage topology structure is more accurate. In another embodiment of the present invention, a greedy algorithm can also be used to select the optimal target sea-land multi-terminal high-voltage topology structure. The embodiment of the present invention enables the selected hungry topology scheme to effectively deal with various fault conditions, ensure power supply reliability, improve the regulation capacity of offshore wind power resources, and reduce the wind abandonment rate and system operation costs.

[0088] According to a method for optimizing an offshore wind power multi-terminal high-voltage direct current topology provided by the present invention, compared with the current method of manually determining the topology structure, the present invention determines a preset number of basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection; and determines the constraint condition information for generating a new topology structure, and generates a new sea and land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures, and the new sea and land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures constitute a sea and land multi-terminal high-voltage topology structure set, and obtains wind power attribute information of each topology structure in the sea and land multi-terminal high-voltage topology structure set; then, based on the wind power attribute information, determines the reliability index coefficient and cost index coefficient of each topology structure in the sea and land multi-terminal high-voltage topology structure set; finally, based on the reliability index coefficient and cost index coefficient, determines the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea and land multi-terminal high-voltage topology structure set. Therefore, the present invention can generate a variety of new sea-land multi-terminal high-voltage topological structures that meet the constraints by generating the constraints of the new topological structure and the sea-land multi-terminal high-voltage topological structure of the basic offshore wind power cluster, thereby increasing the selection range of the topological structure, and can more comprehensively examine the characteristics of various structures when selecting the optimal topological structure, avoiding inaccurate judgments due to lack of sufficient comparison basis, and thus more accurately selecting the optimal target sea-land multi-terminal high-voltage topological structure that meets the power transmission requirements, and then selecting the optimal target sea-land multi-terminal high-voltage topological structure from the new sea-land multi-terminal high-voltage topological structure based on reliability indicators and cost indicators, so that the determined target sea-land multi-terminal high-voltage topological structure can meet both reliability requirements and cost requirements, that is, meet multiple needs, so that the selection of the target sea-land multi-terminal high-voltage topological structure is more accurate.

[0089] Further, in order to better illustrate the above process of optimizing the offshore wind power multi-terminal high-voltage direct current topology, as a refinement and extension of the above embodiment, the embodiment of the present invention provides another offshore wind power multi-terminal high-voltage direct current topology optimization method, such as Figure 3 As shown, the method includes:

[0090] 201. Determine a preset number of offshore wind power clusters based on converter-breaker interconnection and multi-terminal high-voltage topology structures.

[0091] For the embodiment of the present invention, in order to generate a new sea-land multi-terminal high-voltage topology structure, it is first necessary to determine multiple basic offshore wind power cluster sea-land multi-terminal high-voltage topologies based on converter-circuit breaker interconnection. Based on this, step 201 specifically includes: based on the offshore wind farm, the offshore converter system, the submarine DC cable, and the onshore converter system, construct a topology structure in which the DC side of the offshore and onshore converters are connected in pairs with circuit breakers, a topology structure in which the AC side of the offshore and onshore converters are connected in pairs with circuit breakers, a topology structure in which the DC side of the offshore converter and the AC side of the onshore converter are connected in pairs with circuit breakers, and a topology structure in which the AC side of the offshore converter and the DC side of the onshore converter are connected in pairs with circuit breakers.

[0092] Specifically, the need for multi-terminal access is taken into consideration. For example, three offshore wind farms are designed as independent access points, and each wind farm is connected to the system through a dedicated line. This design ensures that even if the opening and closing states of the circuit breaker change, the characteristics of multi-terminal access will not be affected. In terms of realizing the interconnection structure between the converter and the circuit breaker, the embodiment of the present invention takes into account the similarities between onshore and offshore converter systems. In order to flexibly respond to different grid operating conditions and select the optimal high-voltage DC topology, the embodiment of the present invention adopts an innovative connection method: the DC side and the AC side of the three onshore converters and the three offshore converters are connected in pairs through circuit breakers. This design not only enhances the flexibility of the system, but also facilitates switching between AC and DC modes to adapt to the different needs of the power grid. For example, a preset number of basic offshore wind power clusters based on converter-circuit breaker interconnection and sea-land multi-terminal high-voltage topology structures include: Figure 4 The DC sides of the offshore and onshore converters shown are connected in pairs with circuit breakers, as shown in FIG. Figure 5 The AC sides of the offshore and onshore converters shown are connected in pairs with circuit breakers, such as Figure 6 The DC side of the offshore converter and the AC side of the onshore converter are connected in pairs by circuit breakers, as shown in FIG. Figure 7The AC side of the offshore converter and the DC side of the onshore converter are connected in pairs by circuit breakers. If all the circuit breakers are opened in the above topological structures, a point-to-point high-voltage DC topological model is formed, and three lines run in parallel with a simple structure. The advantages of the above topological structures are: there is no commutation failure problem in the DC side interconnection, which is conducive to long-distance power transmission; there is no charging power limit, which can more effectively utilize offshore wind power resources, especially in areas far away from land; the operation mode is flexible and can better adapt to the volatility of wind power output; it occupies a small area and can be used in scenarios with limited space, especially offshore wind farms; although the equipment cost of DC transmission is high, it can save costs in the long run due to the reduction of cable costs and losses when transmitting power over long distances and large capacities. The AC side interconnection structure is simple, and maintenance and operation are relatively easy; it can be directly connected to the existing power grid, which is convenient for the interconnection between wind farms and power grids, and has little impact on the stability and reliability of the power grid; the construction cost of the AC transmission method is relatively low. The above topology has many-to-many high-voltage DC topology models. Adding circuit breaker control can effectively improve transmission efficiency, reduce costs, enhance system reliability and have significant advantages in adapting to harsh environments. Figure 7 As shown, if the submarine DC cable L1 is disconnected for some reason and cannot continue to work, you can choose to close QF4 or QF5 to transmit the electric energy of the offshore wind farm to two lines to realize power supply; if only Lland, the onshore transmission cable, can work normally, you can choose to close QF1 and QF2 to form a one-to-many topology model, and the electric energy of the three offshore wind farms is collected through the submarine DC cable to a line of Lland for transmission. When the absorption capacity of a certain grid connection point on the shore is large, you can choose to connect multiple offshore wind farms in parallel to supply power to the grid connection point. According to the above examples, it can be seen that the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structure determined by the embodiment of the present invention has high reliability.

[0093] 202. Determine constraint information for generating a new topology structure, generate a new onshore and offshore multi-terminal high-voltage topology structure based on the constraint information and the onshore and offshore multi-terminal high-voltage topology structures of each basic offshore wind power cluster, form an onshore and offshore multi-terminal high-voltage topology structure set consisting of the new onshore and offshore multi-terminal high-voltage topology structure and the onshore and offshore multi-terminal high-voltage topology structures of each basic offshore wind power cluster, and obtain wind power attribute information of each topology structure in the onshore and offshore multi-terminal high-voltage topology structure set.

[0094] For the embodiment of the present invention, in order to increase the selectivity of the sea-land multi-terminal high-voltage topology structure, it is also necessary to generate a new sea-land multi-terminal high-voltage topology structure. Based on this, step 202 includes: initializing the configuration parameters of the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster, wherein the configuration parameters include the current carrying capacity of the submarine cable of the offshore wind farm, the purchase cost of the switch cabinet, the installation cost of the switch cabinet, the operation and maintenance cost of each submarine cable per unit length, the operation and maintenance cost of the switch cabinet, the repair cost after the switch cabinet fails, and the repair cost after the failure of each submarine cable per unit length; based on the submarine cable capacity constraint, the submarine cable current carrying capacity constraint, the transmission submarine cable cross constraint, the equipment selection constraint, and the converter quantity constraint of the offshore wind farm, the connection mode between the nodes in the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster after the initialization is transformed to obtain a new sea-land multi-terminal high-voltage topology structure.

[0095] Specifically, a basic set T is set, where a is the onshore AC interconnection topology, b is the onshore DC interconnection topology, c is the offshore AC interconnection topology, and d is the offshore DC interconnection topology. Topologies a, b, c, and d are input into the basic set T to generate a new topology T. new (New basic offshore wind power cluster sea and land multi-terminal high-voltage topology structure). Design cross-topology: The generation of the new topology structure is completed by crossing the previous topology (the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structure after initialization). Only the successful topology is retained to generate the next generation topology. This process can ensure that the global optimal solution is found while satisfying the constraints. Topology T new It is generated by the intersection of T1 and T2 (where T1 and T2 are the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures respectively). T1 and T2 are complementary. For example, T1 is the two topological forms of the onshore converter system and all necessary onshore power infrastructure, that is, including topologies a and b. T2 is the two topological forms of the offshore converter system and all necessary offshore power infrastructure, that is, including topologies c and d. new It is created by connecting T1 and T2 via cables, thus connecting the land and sea power grids.

[0096] 203. Based on wind power attribute information, determine the reliability index coefficient and cost index coefficient of each topology structure in the sea and land multi-terminal high-voltage topology structure set.

[0097] For the embodiment of the present invention, in order to make the target sea-land multi-terminal high-voltage topology structure finally selected meet the reliability requirements, it is first necessary to determine the reliability index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set. Based on this, step 203 specifically includes: based on the maximum transmission capacity information of the cable, the output information of the offshore wind farm, the probability information of cable failure, the probability information of circuit breaker failure, the probability information of wind turbine failure, and the active output information of the wind farm at each time, determine the expected value of annual power generation loss of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the expected value of annual power generation loss and the on-grid electricity price information, determine the expected value of annual power generation loss of each topology structure in the sea-land multi-terminal high-voltage topology structure set. Annual failure opportunity cost coefficient; based on the expected value of annual power generation loss and the total capacity of the system, determine the annual downtime hours coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the expected value of annual power generation loss, the total capacity of the system, and a preset benchmark reference value, determine the system availability coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set; respectively determine the weight coefficients corresponding to the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient, and based on the weight coefficient, add the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient to obtain the reliability index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0098] Specifically, the reliability index coefficient is divided into failure opportunity cost C MC , Annual downtime hours T stop and system availability P use . The annual opportunity cost of failure refers to the potential benefits or value lost due to a failure or failure within one year under specific circumstances. In the embodiment of the present invention, the annual opportunity cost of failure refers to the annual economic loss caused by the failure of the electrical components (converters, circuit breakers, cables, etc.) connected to the power transmission system, resulting in system shutdown, thereby reducing the output power of the wind farm. In addition to considering the system shutdown caused by various electrical component failures, it is also necessary to consider that when the i-th line fails, wind farm i needs to transmit power through other submarine DC cables. The capacity of the remaining submarine DC cables may be less than the total output capacity of the three wind farms, and wind abandonment will occur, which will also cause economic losses. The probability of this happening is p AW The calculation of annual failure opportunity cost involves two indicators: topological equivalent outage rate p stop and the expected annual power generation loss of offshore wind farms E ELPF , the specific calculation formula is as follows:

[0099]

[0100]

[0101]

[0102] C FC =PR1×E ELPF

[0103] Among them, p AW is the probability of wind curtailment caused by capacity. If there is no wind curtailment in the topology, it can be considered that p AW is 1; is the maximum transmission capacity of the jth cable in each topology. When the xth submarine cable fails, j≠x; is the output of the i-th offshore wind farm; p i-stop is the probability that the system is in outage state i; p li is the probability of failure of the i-th cable; p QFj is the probability of failure of the jth circuit breaker; p m-FJ is the probability of failure of the mth group of fans; P Ni is the active power output of the i-th wind farm at time t, and PR1 is the on-grid electricity price. FC is the annual failure opportunity cost coefficient.

[0104] Furthermore, the annual downtime hours coefficient T is calculated according to the following formula: stop :

[0105]

[0106] Among them, Q S is the total system capacity (i.e. the total system capacity of the topology structure).

[0107] Furthermore, the system availability coefficient P is calculated according to the following formula: use :

[0108]

[0109] The preset benchmark reference value may be 8760. Thus, the failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set can be determined in the above manner.

[0110] Furthermore, the weight coefficients corresponding to the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient are set according to actual needs, and based on the weight coefficients, the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient are added together to obtain the reliability index coefficients of each topology structure in the sea and land multi-terminal high-voltage topology structure set.

[0111] In the present embodiment, in order to make the target sea-land multi-terminal high-voltage topology structure finally selected meet the low-cost requirement, it is first necessary to determine the cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set. Based on this, step 203 specifically includes: based on the discount rate and the design life of the offshore wind farm, determine the discount coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the purchase and installation cost of the switch cabinet, the number of submarine cable segments, the price per unit length of the submarine cable, and the coordinates of the wind turbines at both ends of the submarine cable, determine the annualized initial investment cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the number of submarine cable segments, the unit length submarine cable operation and maintenance cost, and the switch cabinet operation and maintenance cost, determine the annual operation and maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the number of submarine cable segments, the submarine cable loss coefficient, the submarine cable working current, and the unit length submarine cable resistance , the length of the submarine cable, the on-grid electricity price, and the annual generating time of the wind turbine, determine the annual line loss cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the sea area used by the offshore wind farm and the annual usage fee per unit sea area, determine the sea area usage fee of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the probability of failure of the switch cabinet, the maintenance cost after the switch cabinet fails, the number of submarine cable segments, the probability of failure of the unit length of the submarine cable, the length of the submarine cable, and the maintenance cost after the unit length of the submarine cable fails, determine the annual maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the discount factor, the annualized initial investment cost, the annual operation and maintenance cost, the annual line loss cost, the sea area usage fee, the annual maintenance cost, and the annual failure opportunity cost coefficient, determine the cost indicator coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0112] Specifically, the discount coefficient, annualized initial investment cost, annual operation and maintenance cost, annual line loss cost, sea area use fee, and annual maintenance cost of each topology are determined according to the following formula:

[0113]

[0114] Where D is the discount factor, C INVis the annualized initial investment cost, which refers to the purchase and installation costs of submarine cables, switch cabinets, booster stations and other equipment converted to annual costs based on the life cycle. OM is the annual operation and maintenance cost, which refers to the cost of annual inspection and maintenance of submarine cables and switch cabinets. LOSS is the annual line loss cost, which refers to the economic loss caused by the power loss of the submarine cable conductor and the dielectric loss during the annual operation. sea is the sea area use fee, C M is the annual maintenance cost, which refers to the cost of repairing switchgear, submarine cables and other components after a failure each year. r is the discount rate. T is the design life of the wind farm. For example, the life of an offshore wind farm is generally 25 years. C switch is the purchase and installation cost of the switch cabinet, N c is the number of submarine cable segments, P i is the price per unit length of submarine cable, (x i1 , x i2 ) and (y i1 ,y i2 ) are the coordinates of the wind turbines at both ends of the i-th section of submarine cable; is the operation and maintenance cost of the i-th submarine cable per unit length, C S-OAM is the switchgear operation and maintenance cost, K SC is the submarine cable loss coefficient, I i is the working current of the submarine cable, R i is the resistance of the i-th submarine cable per unit length, L i is the length of the i-th submarine cable, P R1 is the on-grid electricity price, t is the annual power generation time of the wind turbine (converted to the rated capacity), S is the sea area used by the wind farm, P2 is the annual usage fee per unit sea area, K switch is the probability of switch cabinet failure, is the probability of failure of the i-th submarine cable per unit length, is the maintenance cost after the switch cabinet fails, is the repair cost after the failure of the i-th submarine cable of unit length. According to the above formula, the discount coefficient of each topological structure, the annualized initial investment cost, the annual operation and maintenance cost, the annual line loss cost, the sea area use fee, and the annual repair cost can be calculated, and then the cost index coefficient F of each topological structure is calculated according to the following formula:

[0115] F=C INV +(C OM +C LOSS +C sea +C FC +C M )D

[0116] Among them, C FCis the annual failure opportunity cost coefficient.

[0117] 204. Determine the evaluation weight coefficients corresponding to the reliability index coefficient and the cost index coefficient respectively, and based on the evaluation weight coefficient, add the reliability index coefficient and the cost index coefficient to obtain the performance evaluation parameters of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0118] 205. Based on the performance evaluation parameters, determine the target offshore wind power multi-terminal high-voltage direct current topology structure from the set of offshore and onshore multi-terminal high-voltage topology structures.

[0119] Among them, the evaluation weight coefficient is set according to actual needs. If the reliability index coefficient of a topology structure in the set of multi-terminal high-voltage topology structures on land and sea is 5, its corresponding evaluation weight coefficient is 0.4, and the cost index coefficient is 7, its corresponding evaluation weight coefficient is 0.6, then the final performance evaluation parameter of the topology structure is 6.2. In this way, the performance evaluation parameters of a topology structure in the set of multi-terminal high-voltage topology structures on land and sea can be determined, and finally the topology structure corresponding to the maximum performance evaluation parameter is determined as the optimal target offshore wind power multi-terminal high-voltage direct current topology structure. Therefore, the present invention can generate a variety of new sea-land multi-terminal high-voltage topological structures that meet the constraints by generating the constraints of the new topological structure and the sea-land multi-terminal high-voltage topological structure of the basic offshore wind power cluster, thereby increasing the selection range of the topological structure, and can more comprehensively examine the characteristics of various structures when selecting the optimal topological structure, avoiding inaccurate judgments due to lack of sufficient comparison basis, and thus more accurately selecting the optimal target sea-land multi-terminal high-voltage topological structure that meets the power transmission requirements, and then selecting the optimal target sea-land multi-terminal high-voltage topological structure from the new sea-land multi-terminal high-voltage topological structure based on reliability indicators and cost indicators, so that the determined target sea-land multi-terminal high-voltage topological structure can meet both reliability requirements and cost requirements, that is, meet multiple needs, so that the selection of the target sea-land multi-terminal high-voltage topological structure is more accurate.

[0120] According to another offshore wind power multi-terminal high-voltage direct current topology optimization method provided by the present invention, compared with the current method of manually determining the topology structure, the present invention determines a preset number of basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection; and determines the constraint condition information for generating a new topology structure, and generates a new sea and land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures. The new sea and land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures constitute a sea and land multi-terminal high-voltage topology structure set, and obtains the wind power attribute information of each topology structure in the sea and land multi-terminal high-voltage topology structure set; then, based on the wind power attribute information, determines the reliability index coefficient and cost index coefficient of each topology structure in the sea and land multi-terminal high-voltage topology structure set; finally, based on the reliability index coefficient and cost index coefficient, determines the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea and land multi-terminal high-voltage topology structure set. Therefore, the present invention can generate a variety of new sea-land multi-terminal high-voltage topological structures that meet the constraints by generating the constraints of the new topological structure and the sea-land multi-terminal high-voltage topological structure of the basic offshore wind power cluster, thereby increasing the selection range of the topological structure, and can more comprehensively examine the characteristics of various structures when selecting the optimal topological structure, avoiding inaccurate judgments due to lack of sufficient comparison basis, and thus more accurately selecting the optimal target sea-land multi-terminal high-voltage topological structure that meets the power transmission requirements, and then selecting the optimal target sea-land multi-terminal high-voltage topological structure from the new sea-land multi-terminal high-voltage topological structure based on reliability indicators and cost indicators, so that the determined target sea-land multi-terminal high-voltage topological structure can meet both reliability requirements and cost requirements, that is, meet multiple needs, so that the selection of the target sea-land multi-terminal high-voltage topological structure is more accurate.

[0121] Further, as Figure 1 The specific implementation of the present invention provides an offshore wind power multi-terminal high voltage direct current topology optimization device, such as Figure 8 As shown, the device includes: a first determining unit 31, a generating unit 32, a second determining unit 33, and a third determining unit 34.

[0122] The first determination unit 31 may be used to determine a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-breaker interconnection.

[0123] The generation unit 32 can be used to determine the constraint condition information for generating a new topology structure, and generate a new sea-land multi-terminal high-voltage topology structure based on the constraint condition information and the sea-land multi-terminal high-voltage topology structures of each of the basic offshore wind power clusters. The new sea-land multi-terminal high-voltage topology structure and the sea-land multi-terminal high-voltage topology structures of each of the basic offshore wind power clusters constitute a sea-land multi-terminal high-voltage topology structure set, and obtain wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0124] The second determination unit 33 may be configured to determine the reliability index coefficient and the cost index coefficient of each topology structure in the sea-land multi-terminal high voltage topology structure set based on the wind power attribute information.

[0125] The third determination unit 34 may be configured to determine a target offshore wind power multi-terminal high voltage direct current topology structure in the offshore and onshore multi-terminal high voltage topology structure set based on the reliability index coefficient and the cost index coefficient.

[0126] In a specific application scenario, in order to determine a preset number of basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection, the first determination unit 31 can be specifically used to construct a topology structure in which the DC side circuit breakers of the offshore and onshore converters are connected in pairs, a topology structure in which the AC side circuit breakers of the offshore and onshore converters are connected in pairs, a topology structure in which the DC side of the offshore converter and the AC side of the onshore converter are connected in pairs, and a topology structure in which the AC side of the offshore converter and the DC side of the onshore converter are connected in pairs based on the offshore wind farm, the offshore converter system, the submarine DC cable, and the onshore converter system.

[0127] In a specific application scenario, the constraint information includes: the submarine cable capacity constraint of the offshore wind farm, the submarine cable current carrying capacity constraint, the transmission submarine cable cross constraint, the equipment selection constraint, and the converter quantity constraint; in order to generate a new sea-land multi-terminal high-voltage topology structure, the generation unit 32 includes an initialization module 321 and a transformation module 322.

[0128] The initialization module 321 can be used to initialize the configuration parameters of the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster, wherein the configuration parameters include the submarine cable current carrying capacity of the offshore wind farm, the switch cabinet purchase cost, the switch cabinet installation cost, the operation and maintenance cost of each submarine cable per unit length, the switch cabinet operation and maintenance cost, the repair cost after the switch cabinet fails, and the repair cost after the failure of each submarine cable per unit length.

[0129] The transformation module 322 can be used to transform the connection mode between the nodes in the initialized sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster based on the submarine cable capacity constraint, submarine cable current carrying capacity constraint, transmission submarine cable cross constraint, equipment selection constraint, and converter quantity constraint of the offshore wind farm to obtain a new sea-land multi-terminal high-voltage topology structure.

[0130] In a specific application scenario, in order to generate a new sea-land multi-terminal high-voltage topology structure, the generation unit 32 further includes: a first determination module 323 and a generation module 324 .

[0131] The first determination module 323 can be used to determine the number of wind turbines connected to the submarine cable in the sea-land multi-terminal high-voltage topology structure of the basic offshore wind power cluster, the wind turbine capacity of each wind turbine, the rated output information of each wind turbine, the rated voltage of the submarine cable, the power factor of the submarine cable, the standard submarine cable size set, the standard rated capacity set of the transformer, and the range value of the number of converters.

[0132] The first determination module 323 can also be used to determine the upper limit of the submarine cable capacity based on the number of wind turbines and the wind turbine capacity, and determine the lower limit of the submarine cable current carrying capacity based on the number of wind turbines, the rated output information, the rated voltage of the submarine cable, and the submarine cable power factor.

[0133] The first determination module 323 can also be used to determine the submarine cable selection constraints based on the standard submarine cable size set, determine the transformer selection constraints based on the transformer standard rated capacity set, and determine the converter quantity constraints based on the converter quantity range value.

[0134] The generation module 324 can be used to generate a new sea-land multi-terminal high-voltage topology structure based on the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster when the submarine cable capacity is less than the upper limit of the submarine cable capacity, the current carrying capacity of the submarine cable is greater than the lower limit of the submarine cable current carrying capacity, there is no intersection between the submarine cables in the transmission submarine cable, the submarine cable meets the submarine cable selection constraint, the transformer meets the transformer selection constraint, and the converter meets the converter quantity constraint.

[0135] In a specific application scenario, the wind power attribute information includes: on-grid electricity price information, maximum transmission capacity information of the cable, output information of the offshore wind farm, probability information of cable failure, probability information of circuit breaker failure, probability information of wind turbine failure, active output information of the wind farm at each moment, and the total system capacity of the offshore wind farm; in order to determine the reliability index coefficient of each topology structure in the sea and land multi-terminal high-voltage topology structure set, the second determination unit 33 includes a second determination module 331 and a first addition module 332.

[0136] The second determination module 331 can be used to determine the expected value of annual power generation loss of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the maximum transmission capacity information of the cable, the output information of the offshore wind farm, the probability information of cable failure, the probability information of circuit breaker failure, the probability information of wind turbine failure, and the active output information of the wind farm at each moment.

[0137] The second determination module 331 can also be used to determine the annual failure opportunity cost coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the expected value of annual power generation loss and the grid-connected electricity price information.

[0138] The second determination module 331 can also be used to determine the annual outage hours coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the expected value of annual power generation loss and the total capacity of the system.

[0139] The second determination module 331 can also be used to determine the system availability coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the expected annual power generation loss value, the total system capacity, and a preset benchmark reference value.

[0140] The first adding module 332 can be used to respectively determine the weight coefficients corresponding to the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient, and based on the weight coefficients, add the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient to obtain the reliability index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0141] In a specific application scenario, the wind power attribute information also includes: discount rate, design life of the offshore wind farm, purchase and installation cost of switch cabinet, number of submarine cable segments, price per unit length of submarine cable, coordinates of wind turbines at both ends of the submarine cable, operation and maintenance cost of submarine cable per unit length, operation and maintenance cost of switch cabinet, submarine cable loss coefficient, submarine cable working current, resistance of submarine cable per unit length, submarine cable length, annual power generation time of wind turbine, sea area used by offshore wind farm, annual usage fee per unit sea area, probability of switch cabinet failure, maintenance cost after switch cabinet failure, probability of submarine cable failure per unit length, maintenance cost after submarine cable failure per unit length, and on-grid electricity price; in order to determine the cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set, the second determination module 331 can also be used to determine the discount coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the discount rate and the design life of the offshore wind farm.

[0142] The second determination module 331 can also be used to determine the annualized initial investment cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the purchase and installation cost of the switch cabinet, the number of submarine cable segments, the unit length price of the submarine cable, and the coordinates of the wind turbines at both ends of the submarine cable.

[0143] The second determination module 331 can also be used to determine the annual operation and maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the number of submarine cable segments, the operation and maintenance cost of the submarine cable per unit length, and the operation and maintenance cost of the switch cabinet.

[0144] The second determination module 331 can also be used to determine the annual line loss cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the number of submarine cable segments, the submarine cable loss coefficient, the submarine cable working current, the submarine cable resistance per unit length, the submarine cable length, the on-grid electricity price, and the annual power generation time of the wind turbine.

[0145] The second determination module 331 may also be used to determine the sea area usage fee of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the sea area used by the offshore wind farm and the annual usage fee per unit sea area.

[0146] The second determination module 331 can also be used to determine the annual maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the probability of failure of the switch cabinet, the maintenance cost after the switch cabinet fails, the number of submarine cable segments, the probability of failure of the submarine cable per unit length, the length of the submarine cable, and the maintenance cost after the submarine cable per unit length fails.

[0147] The second determination module 331 can also be used to determine the cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the discount factor, the annual initial investment cost, the annual operation and maintenance cost, the annual line loss cost, the sea area usage fee, the annual maintenance cost, and the annual failure opportunity cost coefficient.

[0148] In a specific application scenario, in order to determine the target offshore wind power multi-terminal high voltage direct current topology structure, the third determination unit 34 includes a second adding module 341 and a third determination module 342 .

[0149] The second adding module 341 can be used to respectively determine the evaluation weight coefficients corresponding to the reliability index coefficient and the cost index coefficient, and based on the evaluation weight coefficient, add the reliability index coefficient and the cost index coefficient to obtain the performance evaluation parameters of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0150] The third determination module 342 may be configured to determine a target offshore wind power multi-terminal high voltage direct current topology structure in the offshore and onshore multi-terminal high voltage topology structure set based on the performance evaluation parameters.

[0151] It should be noted that for other corresponding descriptions of the functional modules involved in the offshore wind power multi-terminal high voltage direct current topology optimization device provided in the embodiment of the present invention, reference can be made to Figure 1 The corresponding description of the method shown will not be repeated here.

[0152] Based on the above Figure 1 The method shown, accordingly, an embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the following steps are implemented: determining a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection; determining constraint condition information for generating a new topology structure, and generating a new sea-land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, and the new sea-land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures constitute a sea-land multi-terminal high-voltage topology structure set, and obtaining wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the wind power attribute information, determining the reliability index coefficient and cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set; based on the reliability index coefficient and cost index coefficient, determining the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea-land multi-terminal high-voltage topology structure set.

[0153] Based on the above Figure 1 The method shown and Figure 8 The embodiment of the device shown in the figure, the embodiment of the present invention also provides a physical structure diagram of a computer device, such as Fig. 9As shown, the computer device includes: a processor 41, a memory 42, and a computer program stored in the memory 42 and executable on the processor, wherein the memory 42 and the processor 41 are both arranged on a bus 43, and the processor 41 implements the following steps when executing the program: determining a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection; determining constraint information for generating a new topology structure, and generating a new sea-land multi-terminal high-voltage topology structure based on the constraint information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, and forming a sea-land multi-terminal high-voltage topology structure set by the new sea-land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, and obtaining wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set; determining the reliability index coefficient and cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the wind power attribute information; and determining the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea-land multi-terminal high-voltage topology structure set based on the reliability index coefficient and the cost index coefficient.

[0154] Through the technical solution of the present invention, the present invention determines a preset number of basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures based on converter-circuit breaker interconnection; and determines the constraint condition information for generating a new topology structure, and based on the constraint condition information and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures, generates a new sea and land multi-terminal high-voltage topology structure, and the new sea and land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures constitute a sea and land multi-terminal high-voltage topology structure set, and obtains the wind power attribute information of each topology structure in the sea and land multi-terminal high-voltage topology structure set; then, based on the wind power attribute information, determines the reliability index coefficient and cost index coefficient of each topology structure in the sea and land multi-terminal high-voltage topology structure set; finally, based on the reliability index coefficient and cost index coefficient, determines the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea and land multi-terminal high-voltage topology structure set. Therefore, the present invention can generate a variety of new sea-land multi-terminal high-voltage topological structures that meet the constraints by generating the constraints of the new topological structure and the sea-land multi-terminal high-voltage topological structure of the basic offshore wind power cluster, thereby increasing the selection range of the topological structure, and can more comprehensively examine the characteristics of various structures when selecting the optimal topological structure, avoiding inaccurate judgments due to lack of sufficient comparison basis, and thus more accurately selecting the optimal target sea-land multi-terminal high-voltage topological structure that meets the power transmission requirements, and then selecting the optimal target sea-land multi-terminal high-voltage topological structure from the new sea-land multi-terminal high-voltage topological structure based on reliability indicators and cost indicators, so that the determined target sea-land multi-terminal high-voltage topological structure can meet both reliability requirements and cost requirements, that is, meet multiple needs, so that the selection of the target sea-land multi-terminal high-voltage topological structure is more accurate.

[0155] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0156] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for optimizing the topology of multi-terminal high voltage direct current (HVDC) offshore wind power, characterized in that: include: Determine a preset number of basic offshore wind power cluster sea and land multi-terminal high-voltage topology structures based on converter-breaker interconnection; Determine constraint information for generating a new topology structure, generate a new sea-land multi-terminal high-voltage topology structure based on the constraint information and the sea-land multi-terminal high-voltage topology structures of each of the basic offshore wind power clusters, form a sea-land multi-terminal high-voltage topology structure set by the new sea-land multi-terminal high-voltage topology structure and the sea-land multi-terminal high-voltage topology structures of each of the basic offshore wind power clusters, and obtain wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Based on the wind power attribute information, determine the reliability index coefficient and cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Based on the reliability index coefficient and the cost index coefficient, a target offshore wind power multi-terminal high-voltage direct current topology structure is determined in the offshore and onshore multi-terminal high-voltage topology structure set.

2. The method according to claim 1, characterized in that The method of determining a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-breaker interconnection includes: Based on the offshore wind farm, offshore converter system, submarine DC cable and onshore converter system, a topological structure of two-connected circuit breakers on the DC side of offshore and onshore converters, a topological structure of two-connected circuit breakers on the AC side of offshore and onshore converters, a topological structure of two-connected circuit breakers on the DC side of offshore converter and the AC side of onshore converter, and a topological structure of two-connected circuit breakers on the AC side of offshore converter and the DC side of onshore converter are constructed.

3. The method according to claim 1, characterized in that The constraint information includes: the submarine cable capacity constraint, the submarine cable current carrying capacity constraint, the transmission submarine cable cross constraint, the equipment selection constraint, and the converter quantity constraint of the offshore wind farm; The generating of a new sea-land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures includes: Initialize the configuration parameters of the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster, wherein the configuration parameters include the current carrying capacity of the submarine cable of the offshore wind farm, the purchase cost of the switch cabinet, the installation cost of the switch cabinet, the operation and maintenance cost of each submarine cable per unit length, the operation and maintenance cost of the switch cabinet, the repair cost after the switch cabinet fails, and the repair cost after the failure of each submarine cable per unit length; Based on the submarine cable capacity constraints, submarine cable current carrying capacity constraints, transmission submarine cable cross constraints, equipment selection constraints, and converter quantity constraints of the offshore wind farm, the connection mode between the nodes in the initialized sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster is transformed to obtain a new sea-land multi-terminal high-voltage topology structure.

4. The method according to claim 3, characterized in that The generating of a new sea-land multi-terminal high-voltage topology structure based on the constraint condition information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures includes: Determine the number of wind turbines connected to the submarine cable in the sea-land multi-terminal high-voltage topology of the basic offshore wind power cluster, the wind turbine capacity of each wind turbine, the rated output information of each wind turbine, the rated voltage of the submarine cable, the power factor of the submarine cable, the standard submarine cable size set, the standard rated capacity set of the transformer, and the range value of the number of converters; Based on the number of wind turbines and the wind turbine capacity, determine the upper limit of the submarine cable capacity; based on the number of wind turbines, the rated output information, the rated voltage of the submarine cable, and the power factor of the submarine cable, determine the lower limit of the current carrying capacity of the submarine cable; Determining a submarine cable selection constraint based on the standard submarine cable size set, determining a transformer selection constraint based on the transformer standard rated capacity set, and determining a converter quantity constraint based on the converter quantity range value; When the submarine cable capacity is less than the upper limit of the submarine cable capacity, the current carrying capacity of the submarine cable is greater than the lower limit of the submarine cable current carrying capacity, there is no intersection between the submarine cables in the transmission submarine cable, the submarine cable meets the submarine cable selection constraints, the transformer meets the transformer selection constraints, and the converter meets the converter quantity constraints, a new sea-land multi-terminal high-voltage topology structure is generated based on the sea-land multi-terminal high-voltage topology structure of each basic offshore wind power cluster.

5. The method according to claim 1, characterized in that The wind power attribute information includes: on-grid electricity price information, maximum transmission capacity information of cables, output information of the offshore wind farm, probability information of cable failure, probability information of circuit breaker failure, probability information of wind turbine failure, active output information of the wind farm at each moment, and total system capacity of the offshore wind farm; The step of determining the reliability index coefficient of each topology structure in the sea-land multi-terminal high voltage topology structure set based on the wind power attribute information includes: Based on the maximum transmission capacity information of the cable, the output information of the offshore wind farm, the probability information of cable failure, the probability information of circuit breaker failure, the probability information of wind turbine failure, and the active output information of the wind farm at each moment, determine the expected value of annual power generation loss of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Based on the expected value of annual power generation loss and the grid-connected electricity price information, determine the annual failure opportunity cost coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Based on the expected value of annual power generation loss and the total capacity of the system, determine the annual outage hours coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Determine the system availability coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the expected value of annual power generation loss, the total system capacity, and a preset benchmark reference value; The weight coefficients corresponding to the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient are determined respectively, and based on the weight coefficients, the annual failure opportunity cost coefficient, the annual downtime hours coefficient, and the system availability coefficient are added together to obtain the reliability index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set.

6. The method according to claim 1, characterized in that The wind power attribute information also includes: discount rate, design life of the offshore wind farm, purchase and installation cost of switch cabinet, number of submarine cable segments, price per unit length of submarine cable, coordinates of wind turbines at both ends of the submarine cable, operation and maintenance cost per unit length of submarine cable, operation and maintenance cost of switch cabinet, loss coefficient of submarine cable, working current of submarine cable, resistance per unit length of submarine cable, length of submarine cable, annual power generation time of wind turbine, sea area used by offshore wind farm, annual usage fee per unit sea area, probability of switch cabinet failure, maintenance cost after switch cabinet failure, probability of submarine cable failure per unit length, maintenance cost after submarine cable failure per unit length, and on-grid electricity price; Based on the wind power attribute information, the cost index coefficient of each topology structure in the sea-land multi-terminal high voltage topology structure set is determined, including: Determining the discount coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the discount rate and the design life of the offshore wind farm; Based on the purchase and installation cost of the switch cabinet, the number of segments of the submarine cable, the price per unit length of the submarine cable, and the coordinates of the wind turbines at both ends of the submarine cable, determine the annualized initial investment cost of each topology in the sea-land multi-terminal high-voltage topology set; Based on the number of submarine cable segments, the operation and maintenance cost of the submarine cable per unit length, and the operation and maintenance cost of the switch cabinet, determine the annual operation and maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Based on the number of submarine cable segments, the submarine cable loss coefficient, the submarine cable operating current, the submarine cable resistance per unit length, the submarine cable length, the on-grid electricity price, and the annual power generation time of the wind turbine, determine the annual line loss cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Determine the sea area usage fee for each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the sea area used by the offshore wind farm and the annual usage fee per unit sea area; Based on the probability of failure of the switch cabinet, the maintenance cost after the failure of the switch cabinet, the number of submarine cable segments, the probability of failure of the submarine cable per unit length, the length of the submarine cable, and the maintenance cost after the failure of the submarine cable per unit length, determine the annual maintenance cost of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Based on the discount factor, the annualized initial investment cost, the annual operation and maintenance cost, the annual line loss cost, the sea area use fee, the annual maintenance cost, and the annual failure opportunity cost coefficient, the cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set is determined.

7. The method according to claim 1, characterized in that The step of determining a target offshore wind power multi-terminal high voltage direct current topology structure in the offshore and onshore multi-terminal high voltage topology structure set based on the reliability index coefficient and the cost index coefficient includes: Determine the evaluation weight coefficients corresponding to the reliability index coefficient and the cost index coefficient respectively, and based on the evaluation weight coefficient, add the reliability index coefficient and the cost index coefficient to obtain the performance evaluation parameters of each topology structure in the sea-land multi-terminal high-voltage topology structure set; Based on the performance evaluation parameters, a target offshore wind power multi-terminal high voltage direct current topology structure is determined in the offshore and onshore multi-terminal high voltage topology structure set.

8. An offshore wind power multi-terminal high voltage direct current topology optimization device, characterized in that: include: A first determination unit is used to determine a preset number of basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures based on converter-breaker interconnection; A generating unit, used to determine constraint information for generating a new topology structure, generate a new sea-land multi-terminal high-voltage topology structure based on the constraint information and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, form a sea-land multi-terminal high-voltage topology structure set by the new sea-land multi-terminal high-voltage topology structure and each of the basic offshore wind power cluster sea-land multi-terminal high-voltage topology structures, and obtain wind power attribute information of each topology structure in the sea-land multi-terminal high-voltage topology structure set; A second determination unit is used to determine the reliability index coefficient and the cost index coefficient of each topology structure in the sea-land multi-terminal high-voltage topology structure set based on the wind power attribute information; The third determination unit is used to determine the target offshore wind power multi-terminal high-voltage direct current topology structure in the sea-land multi-terminal high-voltage topology structure set based on the reliability index coefficient and the cost index coefficient.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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